This is simple, and the pictures tell you enough. Denkimono.com offers you the possibility to buy a kit of this alarmclock/timer that you can assembly yourself. It is available in 2 modes as a kit or ready assembled. The kit comprises of a PCB and all the necessary components.
The assembled version comprises of a fully populated and tested CPU and display PCB. All that is required is for the two boards to be connected together and mounted on the battery. Printed instructions are provided with both forms of the product. I don’t think they supply you with schematics. That would have been nice to give others the opportunity to build the project themselves. But its their idea and their right to sell it. For full details and ordering click the Link.